From owner-cvs-all  Wed May 29 16:51:23 2002
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Date: Wed, 29 May 2002 16:50:56 -0700 (PDT)
From: Matthew Jacob <mjacob@feral.com>
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To: Peter Wemm <peter@wemm.org>
Cc: Marcel Moolenaar <marcel@xcllnt.net>,
	Jens Schweikhardt <schweikh@schweikhardt.net>,
	Garrett Wollman <wollman@khavrinen.lcs.mit.edu>,
	cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: Re: cvs commit: src/sys/sys gpt.h 
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On Wed, 29 May 2002, Peter Wemm wrote:

> Marcel Moolenaar wrote:
> > On Wed, May 29, 2002 at 11:32:48PM +0200, Jens Schweikhardt wrote:
> > > 
> > > It is. The answer is sizeof (struct X). You are the one to make
> > > nonportable assumptions by thinking there must be no padding.
> > 
> > No, I assume that the compiler does do gratuitous padding, beyond
> > what is reasonable or expected. Especially not to extend the size
> > of the struct after the last field.
> 
> This has got me before.  The usual behavior is that the stuct is rounded up
> to be an even multiple of the most restrictive alignment requirement of
> members.  This is so that sizeof(struct foo[20]) == sizeof(struct foo) * 20.
> 
> I have a vague recollection that I saw a compiler a long time ago (early
> Lattice C on the Amiga possibly?) where this wasn't the case.

Many compilers. Borland C or any of the i386 compilers that assumed you wanted
pragma packed IIRC.



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